andrews



2 Sheets- Sheet 1.

ANDREWS. APPARATUS FOR TEMPERING AND FLATTENING SHEET METAL PLATES.

No. 284,938.' Patented Sept. 11, 1883.

v was: edimi. Yvm n ull N. PETERS. Pmlo-Limn rlphcr Wash 0 r;

2 M 8 h S A m in 6 h S 2 S W .E R D N A B m a 0 M O W APPARATUS FOR TEMPERING AND FLATTENING SHEET METAL PLATES.

Patented Sept, 11, 1-883.

hu. Washhlginn. u. c.

UNITED STATES PAT NT @rrron.

EMANUEL'ANDREXVS, OF \VILLIAMSPORT, PEXNSYLVANIA.

APPARATUS FOR T EMPERlNG AND FLATTENING SHEET-METAL PLATES.

SPECIFICATION forming part of Letters Patent No. 284,988, dated September 11, 1888.

Application filed April 5, 1853.

in all whom it mag} concern:

Be it known that I, EMANUEL ANDRnws, of XVilliamsport, in the county of Lycoming and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Tempering and Flattening Sheet-Metal Plates; and I do hereby declare that the following is a full and exact description of the same, reference being'had to the accompanying drawings, and to the letters of reference marked thereon. v

My invention relates to an improvement in apparatus for tempering and flattening sawplates, but equally well adapted for tempering and flattening other metal plates.

The invention therein consists in a novel construction of the furnace and arrangement of its principal operative parts; in the arrangement of the lines to prevent the direct action of the heat upon the contactsurfaces of the tempering-plates, and thereby exclude the presence of scales or blisters upon the surfaces of the saw or other plates which are being treated, and, finally, in the construction of the tempering-plates, to the end that they may maintain a uniform temperature ofheat and evenly distribute the same over the surfaces of the saw or other plates, all as more fully hereinafter described, and set forth in the claims.

Throughout the following description reference will be made to the accompanying drawings, which clearly illustrate the apparatus and my improvements therein. v

Figure l is an elevation inperspective of an apparatus constructed in accordance with my invention; Fig. 2, a vertical transverse section of the same, omitting the mechanism for depressing the upper former, and showing the smoke-pipe connected with the chimney; and Fig. 3, a view in detail of one of the tempering-plates.

Like letters of reference denote corresponding.parts in each figure.

The furnace illustrated is built of fire-brick,

in which A denotes the fire-box, and B the ash-pit, both with suitable doors and located, preferably, at the front end of the furnace. To the rear of the fire-box and ash-pit and at the center of the furnace is'a large rectangular opening, 0, in the bottom of which is located (No model.)

the lower and stationary former, D." This former is composed of a base-plate, E, of rectangular shape, and provided at each of its corners with a cylindrical socket, through which passes a rod, a, secured in the base of thefurnacc and extending upwardly through and some distance above the end walls of said furnace. The corners ofthis base-plate E each rest upon a spiral spring, a, wound around the base of each rod a, for the purpose of allowing said plate to recede and give way to the down-pressure of the upper former, presently to be described. The base-plate E is provided on its upper surface with numerous metal pins or supports, I) b, which pass entirely through and out of the top of a hollow drum, F, of rectangular form, and intended to be filled with non-conducting material to prevent the escape of heat by radiation. The upper ends of these metal pins Z) I) support the temperingplate G at some distance above the top of the drum F, thus leaving a clear open flue-space, c, in which are equally diffused the products of combustion coming from the flue d, which connects the open space 0 with the fire-box, as shown in Fig. 2. Bolts a, passing down through the tempering-plate Gr and drum F, tie the said parts together. The to mperingplate G is hollow and preferably of rectangular form, and is provided on its interior, as

shown, with numerous pins or supports, 6, to sustain the pressure imposed upon it by the upper former. The tempering-plate thus constructed is filled with lead or any metal that will fuse at about the temperature of lead. By the fusing of the lead an even and uniform temperature of heat is maintained and distributed over the surface of the temperingplate, thereby accomplishing an essential feature in tempering-machines and attaining admirable results in the treatment of saw-blades.

The upper former, D, is located in the upper part of the large rectangular opening 0, and is composed of a top-plate, E, corresponding in all respects with the base-plate of the lower former. This top plate is loosely fitted over the rods to a a a, (above the furnace,) in order that it may have vertical movement thereon, and rests upon numerous metal pins or supports, 1) b, which pass entirely through a hollow drum, F, to a tempering-plate, G,

IOO

the said drum being secured to the top plate pressingthc upper former, it can conveniently by means of bolts (6. This drum and tempering-plate are constructed, arranged, and secured together in precisely the same manner as are those of the lower former. After the products of combustion enter and are diffused in the space 0, between the drum and tempering-plate of the lower former, they pass into a flue, (Z, (located at the rear of the' tempering-plates,) and thence up and around into a clear open space, located between the drum and tempering-pl ate of the upper former and corresponding with the space 0 of the lower former. The products of combustion, having been diffused in. the space 0, pass thence into pipes II H, and through them and into the smoke-pipe I, connecting with the stack. The pipes H H connect with a plate, f, secured to the front sides of the drum F and tempering-plate G, over the open space 0', thus closing the same to the escape of the products of combustion and compelling them to pass out by way of the said exit-pipes. As the exit pipes and the smoke-pipe form a rigid connection with the upper former, and thereby must rise and fall with the same, that end of the smoke-pipe entering the stack must likewise be free to act concurrently with the movement of the upper former. For this purpose I prc: fer to use a ring, h, which encircles the smokepipe I at the point shown, and has pivoted to it at diametrically-opposite points one end of two arms, 71. 71., whose free ends are pivoted in the walls of the stack, as shown in Fig. 2.

In order to exert pressure upon the upper former and bring it in contact with the lower former, I prefer to employ a toggle-j oint mechanism, which connects the top plate, E, with a plate, J, rigidly mounted upon the upper ends of the rods a a a a. The aboverelcrred tomechanism is of ordinary construction, and consists of two pairs of metal castings, K K and K K, arranged. one upon each side of the center of the upper former. Each pair is loosel T 'ointed at its center and is loosel 1 connected at each end with the plates J and E, respectively. The two pairs of castings are connected together and adapted to operate conjointly with one another by means of two arms, 7;, each of which is loosely mounted at one end upon the center of the shaft which centrally connects each pair of castings. The free ends of the arms k are pivoted in the recessed ends of a crosshead, L, through the center of which passes a screw-threaded shaft, L, provided at its upper end and above the plate J with a beveled-gear wheel, m, traveling in a horizontal plane'and-meshing with a similar wheel, m, arranged at a right angle thereto upon a shaft, M. This shaft has suitable bearings in supports an, andis provided at its outer or free end with a driving-wheel, N, which, when operated by the hand or other power, enables the upper former to be raised or depressed by the movement communicated to the toggle-j oint mechanism. Although this mechanism is preferred as a means for de be dispensed with and other suitable meehanism substituted.

The saws or other metal plates to be treated by this apparatus are preferably introduced and withdrawn at the front end of the furnace or at the point indicated by the letter X. By constructing the tempering-plates and arranging the fines as herein described it will. be apparent that the contact-surfaces of the tempering-plates are not exposed to the direct action of the products of combustion, thus rendering it impossible for the saw-plates under treatment to blister, as frequently results in machines wherein the products of combustion are permitted to directly strike the surface on which the saw-plates are placed -to be treated.

It will further be apparent that by the fusion of the lead contained within the hollow tempering-plates they are more evenly heated than would be the case if the said plates were made solid. Uniform heat is a very import-ant and valuable feature in temperingmachines, for without it a saw-blade cannot be tempered uniformly, and thus be made to do true, uniform work. 3

The formers herein employed have been described as being rectangular in shape; but it will be manifest that they can be shaped in a variety of ways without affecting their operation.

Having thus described my invention and enumerated some of its advantages, what I claim, and desire to secure by Letters Patent,

1. A bed for tempering and flattening saw or other metal plates, composed of a shell. filled with lead or similar fusible metal, substanti ally as set forth.

2. In a furnace of substantially the character described, two tempering and flattening bed-surfaces, each composed of a shell filled with lead or similar fusible material, arranged one above the other, with an intermediate space for the reception of the saw or other metal plates to be treated, substantially as set forth.

3. In a furnace of substantially the character described, two tempering and flattening bed-surfaces, each composed of a shell filled with lead or similar fusible material, arranged one above the other, with an intermediate space for the reception of the saw or othermetal plates to be treated, and a continuous flue or flues adapted to carry the products of combustion under the lower bed-surface and over the upper bed-surface, substantially as set forth.

4:. A furnace for tempering and flattening saw and other metal plates, having a stationary and a vertically-movable forn1cr,- each provided with a hollow tempering-plate having pins or supports, and filled with lead or equivalent metal, substantially as and for the purpose set forth.

5. In a furnace for tempering and flattening saw and other metal plates, the combinaand is pressed by suitable means toward the tion, with the formers and tempering-plates, lower or stationary one, which has similar r substantially as described, of a flue leading bearings upon said rods and rests at its several 1 from the fire-box, as shown, and communipoints of bearing upon springs around the 5 eating with exit-pipes rigidly secured to the base of said rods, substantially as and for the upper former, and connecting with a smokepurpose set forth.

pipe hinged to the stack, substantially as de- In testimony whereof I affix my signature in scribed, shown, and for the purpose set forth. presence of two witnesses.

6. In a furnace of substantially the charac- EMANUEL ANDREWS. 1o ter described, the combination of two temper- Vitnesses:

ing and flattening devices, the upper one of F. M. ANDREws, which has vertical bearings upon upright rods, XV. T. ANDREWS. 

